Historic European churches and cathedrals are high on many travelers’ to-see lists. People admire the soaring vaulted ceilings and richly colored stained glass windows. Look closer, though, and you’ll see things you weren’t expecting.

Like this lovely lady at the Romanesque church of Saint Mary and Saint David in Kilpeck, Herefordshire, England, shown here courtesy Wikimedia Commons. Yes, she’s doing exactly what it looks like she’s doing. And she’s not the only one. Sculptures of naked ladies spreading it for all to see decorate numerous churches. Most are in Ireland and smaller numbers can be found in England and continental Europe.

They’re called Sheela-na-gigs and nobody has any idea what they mean. It’s uncertain when they were made as the churches they’re found on date from several centuries and some Sheela-na-gigs appear to have been reused from earlier buildings.

So why were they put in churches? Some people like to see them as pagan survivals, although that fails to explain why church authorities would permit them in churches. A bit of support for this comes from the Royal Navy, of all things. An 18th century Navy ship was named Sheela-na-gig and in the ship’s listing the name is explained as a “female sprite.” Other researchers think they’re symbols of the sinful nature of women. While this is possible, it fails to explain why the women aren’t being shown in Hell or being punished by devils, as is typical of didactic church art.

%Gallery-167773%Another mystery is the Green Man. This is a face surrounded by leaves and buds. Sometimes greenery is coming out of the Green Man’s mouth. At first glance it appears to be a very pagan symbol. Indeed, a similar type of leafy face was common in Roman art but died out when Classical art died. The Green Man reappeared in church art in the 11th century. He became hugely popular in Victorian Britain, which celebrated both nature and Classical art.

Once again, we’re stuck for an explanation. Pagan symbol or co-opted Classical decoration? Perhaps a fertility symbol celebrating the abundance of spring in what was still a predominantly agricultural society? Like with the Sheela-na-gigs, the Church didn’t leave records as to why they appear in a religious building.

The motive behind another odd bit of church art is all too clear – the Judensau, or “Jew’s sow.” In this scene a large sow is being suckled by a number of Jews, identifiable by the conical hats they were forced by law to wear. Another Jew is shown lifting up the sow’s tail to lick its rear. Often a Semitic-looking Devil stands by watching in approval. This disgusting bit of anti-Semitism first appeared in medieval Germany and remained a popular church “decoration” for several hundred years. The image seems to be limited to German-speaking areas and is found on churches and cathedrals and occasionally secular buildings.

The Stadtkirche in Wittenberg has a famous example on the exterior wall, clearly visible from the street. Martin Luther mentioned it in one of his anti-Semitic writings: “Here on our church in Wittenberg a sow is sculpted in stone. Young pigs and Jews lie suckling under her. Behind the sow a rabbi is bent over the sow, lifting up her right leg, holding her tail high and looking intensely under her tail and into her Talmud, as though he were reading something acute or extraordinary, which is certainly where they get their Shemhamphoras.” In the last line, Luther is talking about the Hebrew term for the ineffable name of God, thus insulting their beliefs as well as their dignity.

In modern times a memorial plaque was put beneath it acknowledging that six million Jews were killed “under the sign of the Cross.”